package com.lczyfz.campusinfo.modules.thirdpay.wxpay.impl;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.net.ssl.SSLException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpRequest;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.config.CookieSpecs;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
public class HttpClientUtil {
    private HttpClientUtilRetryHandler httpClientUtilRetryHandler;
    /** 对象 */
    private static HttpClientUtil httpClientUtil;

    /** 设置重试策略 */
    public HttpClientUtil setHttpClientUtilRetryHandler(
            HttpClientUtilRetryHandler httpClientUtilRetryHandler) {
        this.httpClientUtilRetryHandler = httpClientUtilRetryHandler;
        return this;
    }

    /** 获取 */
    public static HttpClientUtil getInstance() {
        if (httpClientUtil == null) {
            return new HttpClientUtil();
        }
        return httpClientUtil;
    }


    /**
     * 开启重试策略的post
     *
     * @param url
     * @param encode
     * @param params
     * @return
     * @throws Exception
     */
    public String httpPost(String url, String encode, Map<String, String> params)
            throws Exception {
        try {
            return post(url, encode, params);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            if (httpClientUtilRetryHandler == null) {
                throw new Exception("远程调用重试策略未启用");
            }
            int count = 1;
            while (httpClientUtilRetryHandler.retry(count)) {
                count++;
                try {
                    return post(url, encode, params);
                } catch (Exception e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
            throw new Exception("远程调用失败");
        }
    }

    /**
     * 开启重试策略的post
     *
     * @param url
     * @param encode
     * @param requestBody
     * @return
     * @throws Exception
     */
    public String httpPost(String url, String encode, String requestBody)
            throws Exception {
        try {
            return post(url, encode, requestBody);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            if (httpClientUtilRetryHandler == null) {
                throw new Exception("远程调用重试策略未启用");
            }
            int count = 1;
            while (httpClientUtilRetryHandler.retry(count)) {
                count++;
                try {
                    return post(url, encode, requestBody);
                } catch (Exception e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
            throw new Exception("远程调用失败");
        }
    }

    /**
     * 开启重试策略的get
     *
     * @param url
     * @param encode
     * @return
     * @throws Exception
     */
    public String httpGet(String url, String encode) throws Exception {
        try {
            return get(url, encode);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            if (httpClientUtilRetryHandler == null) {
                throw new Exception("远程调用重试策略未启用");
            }
            int count = 1;
            while (httpClientUtilRetryHandler.retry(count)) {
                count++;
                try {
                    return get(url, encode);
                } catch (Exception e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
            throw new Exception("远程调用失败");
        }
    }


    /**
     * httpclient get请求
     *
     * @param url
     * @param encode
     * @return
     * @throws Exception
     */
    private String get(String url, String encode) throws Exception {
        CloseableHttpClient httpclient = HttpClients.custom()
                .setRetryHandler(new CloseableHttpClientRetryHandler()).build();
        HttpGet httpget = new HttpGet(url);
        CloseableHttpResponse response = null;
        // 设置请求和传输超时时间5s,设置cookie策略
        RequestConfig requestconfig = RequestConfig.custom()
                .setSocketTimeout(1000 * 60).setConnectTimeout(1000 * 60)
                .setCookieSpec(CookieSpecs.DEFAULT).build();
        httpget.setConfig(requestconfig);
        try {
            response = httpclient.execute(httpget);
            // 判断访问的状态码
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                // 状态非200
                throw new Exception("远程连接失败");
            }

            HttpEntity entity = response.getEntity();
            String responseStr = "";
            if (entity != null) {
                responseStr = EntityUtils.toString(entity, encode);
            }
            EntityUtils.consume(entity);
            return responseStr;
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            throw new Exception("远程调用失败");
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                if (httpget != null) {
                    httpget.releaseConnection();
                }
                if (httpclient != null) {
                    httpclient.close();
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    /**
     * httpclient post请求
     *
     * @param url
     * @param encode
     * @return
     * @throws Exception
     */
    private String post(String url, String encode, Map<String, String> params)
            throws Exception {
        CloseableHttpClient httpclient = HttpClients.custom()
                .setRetryHandler(new CloseableHttpClientRetryHandler()).build();
        HttpPost httpPost = new HttpPost(url);
        CloseableHttpResponse response = null;
        RequestConfig requestconfig = RequestConfig.custom()
                .setSocketTimeout(1000 * 60).setConnectTimeout(1000 * 60)
                .setCookieSpec(CookieSpecs.DEFAULT).build();
        httpPost.setConfig(requestconfig);
        try {
            // 将要POST的数据封包
            if (params != null && params.size() > 0) {
                Set<String> paramsSet = params.keySet();
                List<NameValuePair> nvps = new ArrayList<NameValuePair>();
                for (String key : paramsSet) {
                    nvps.add(new BasicNameValuePair(key, params.get(key)));
                }
                httpPost.setEntity(new UrlEncodedFormEntity(nvps, encode));
            }
            // execute
            response = httpclient.execute(httpPost);
            // 判断访问的状态码
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                // 状态非200
                throw new Exception("远程连接失败");
            }
            HttpEntity entity = response.getEntity();
            String responseStr = "";
            if (entity != null) {
                responseStr = EntityUtils.toString(entity, encode);
            }
            EntityUtils.consume(entity);
            return responseStr;
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            throw new Exception("远程调用失败");
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                if (httpPost != null) {
                    httpPost.releaseConnection();
                }
                if (httpclient != null) {
                    httpclient.close();
                }

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }


    /**
     * httpclient post请求
     *
     * @param url
     * @param encode
     * @param requestBody
     * @return
     * @throws Exception
     */
    private String post(String url, String encode, String requestBody)
            throws Exception {
        CloseableHttpClient httpclient = HttpClients.custom()
                .setRetryHandler(new CloseableHttpClientRetryHandler()).build();

        HttpPost httpPost = new HttpPost(url);
        CloseableHttpResponse response = null;
        RequestConfig requestconfig = RequestConfig.custom()
                .setSocketTimeout(1000 * 60).setConnectTimeout(1000 * 60)
                .setCookieSpec(CookieSpecs.DEFAULT).build();
        httpPost.setConfig(requestconfig);
        try {
            httpPost.setEntity(new StringEntity(requestBody,encode));
            // execute
            response = httpclient.execute(httpPost);
            // 判断访问的状态码
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                // 状态非200
                throw new Exception("远程连接失败");
            }
            HttpEntity entity = response.getEntity();
            String responseStr = "";
            if (entity != null) {
                responseStr = EntityUtils.toString(entity, encode);
            }
            EntityUtils.consume(entity);
            return responseStr;
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            throw new Exception("远程调用失败");
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                if (httpPost != null) {
                    httpPost.releaseConnection();
                }
                if (httpclient != null) {
                    httpclient.close();
                }

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }


    /**
     * 重试策略
     *
     * @author heyewei
     *
     */
    static class CloseableHttpClientRetryHandler implements
            HttpRequestRetryHandler {

        @Override
        public boolean retryRequest(IOException exception, int executionCount,
                                    HttpContext context) {
            // TODO Auto-generated method stub
            // 设置恢复策略，在发生异常时候将自动重试5次
            if (executionCount >= 5) {
                // 如果已经重试了5次，就放弃
                return false;
            }
            if (exception instanceof InterruptedIOException) {
                // 超时
                return true;
            }
            if (exception instanceof UnknownHostException) {
                // 目标服务器不可达
                return true;
            }
            if (exception instanceof ConnectTimeoutException) {
                // 连接被拒绝
                return true;
            }
            if (exception instanceof SSLException) {
                // ssl握手异常
                return false;
            }
            HttpClientContext clientContext = HttpClientContext.adapt(context);
            HttpRequest request = clientContext.getRequest();
            boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
            if (idempotent) {
                // 如果请求是幂等的，就再次尝试
                return true;
            }
            return false;
        }

    }

    /**
     * 内部httpclient的重试策略
     *
     * @author heyewei
     *
     */
    public static class HttpClientUtilRetryHandler {

        public boolean retry(int count) {
            if (count > 3) {
                return false;
            }
            return true;
        }

    }
}
